/Engine/Source/Runtime/Renderer/Public/MeshPassProcessor.h
Returns the pipeline state sort key, which can be used for sorting material draws to reduce context switches.
uint64 GetPipelineStateSortingKey ( [FRHICommandList](API\Runtime\RHI\FRHICommandList) & RHICmdList, const [FGraphicsPipelineRenderTargetsInfo](API\Runtime\RHI\FGraphicsPipelineRenderTargetsIn-) & RenderTargetsInfo ) const